Indiana Code Title 6. Taxation § 6-2.5-6-3

Sec. 3. If a retail merchant, wholesaler, or manufacturer holds multiple certificates under IC 6-2.5-8 in order to make retail transactions at more than one (1) store or location, the retail merchant may apply for departmental permission to file a consolidated state gross retail and use tax return for all those stores and locations.  If the department allows the consolidated filing, the retail merchant, wholesaler, or manufacturer must keep sufficient records to allow the department to determine the separate state gross retail and use tax liability for each store or location and to show any information that the department requires on the consolidated return.